breeding pen question

I am sure if I spent hrs searching I would find my answer, but anyhoo,

I am wanting to building a breeding pen about 10' long very very similar to GQF breeding pen setup. My question is about the floor. It doesn't look like normal 1/2" wire, it looks like flat expanded metal of some kind. Does anyone know if eggs will roll down the standard 1/2" wire? The local stores only have 1/2" hardware cloth which I think may be too flemsy and not smooth enough to allow eggs to roll. Does anyone have any experience making a rolled floor?

Thanks